#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main()
{
    int n = 0, h = 0, m = 0;
    int flag = 0, a = 0;

    scanf("%d %d %d", &n, &h, &m);

 
    flag = m % h;
    if (flag == 0)
    {
        a = n - m / h;
    }
    else {
        {
            a = n - (m / h) + 1;
        }
    }
    printf("%d", a);
    return 0;
}